Adobe hasn't updated Livemotion for a couple of years. It's definitely getting stale.
But yeah- livemotion's scripting is definitely not finished (usable?). Flash's animation tools are wretched. Someone needs to take the initiative.
Are you high? Just because YOU can't seem to figure out Flash doesn't make it "unuseable". Flash is an amazing technology that get's a bad rap from web designers who don't have any taste implementing it in hideous ways. But it is VERY usable. Flash 5 is such an evolution from what it started out as, and has become a multimedia authoring standard. Any medium level designer can figure out how to create animations with ease. Any designer can implement basic interactivity very easily. And seasoned scripters can create just about anything they can think up...
LiveMotion missed it's window of opportunity. If Adobe had released LiveMotion before Flash 4, it would have put a serious dent in Flash's user base. But when Flash 4 came out, it included some basic scripting. When Flash 5 beefed up the scripting capabilities and LiveMotion came out with no scripting capabilities, it seriously limited it's usefullness with serious designers. I think Adobe had the edge with the interface with users who were coming from using After Effects or ImageStyler, of which both were borrowed from for LiveMotion.